Problem solving when new handwritten hello driver

When the new hello driver is handwritten, the problem is solved-Linux general technology-Linux programming and kernel information. The following is a detailed description. The younger brother just started to learn about linux simple driver. The driver can be insmod, but when an application is executed to call this driver, it does not respond because it is printed when I run the open () function.
This is the driver source code.
# Include
# Include
# Include
# Include
# Include
# Include
# Include
# Include
# Include
# Include

Static int hello_drv_open ()
{
Printk ("hello beautiful world !! \ N ");
Return 0;
}
Static int hello_drv_write ()
{
Printk ("crul world! \ N ");
Return 0;

}
Static struct file_operations hello_drv_fops () =
{
. Owner = THIS_MODULE,
. Open = hello_drv_open,
. Write = hello_drv_write,
}
Static int hello_drv_init (void)
{
Register_chrdev (260, "hello", & hello_drv_fops );
Return 0;
}
Void hello_drv_exit ()
{
Unregister_chrdev (260, "hello ");
}
Module_init (hello_drv_init );
Module_exit (hello_drv_exit );
Below is the test program
# Include
# Include
# Include
# Include
Int main (int argc, char ** argv)
{
Int fd;
Int val = 1;
Fd = open ("/dev/hello", O_RDWR );
If (fd <0)
Printf ("your directory can not open \ n ");
Write (fd, & val, 4 );
Return 0;
}
Solution